SolaHD DIN Rail Power Supplies - EXPANSION Three phase power supplies now available in the SDN-C DIN Rail Series from Sola HD. View the entire SDN-C Series . SolaHD SDN-C DIN Rail Power Supplies combine high efficiency and compact size with new visual diagnostic LEDs. Features for the SolaHA SDN-C DIN Rail Power Supplies include Sag Immunity , Power Factor Correction , universal voltage input, and adjustable output voltage. With an operating temperature from -25ºC to 60ºC and parallel operation capability, the new SDN-C units are suitable for a variety of industrial applications.